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Related Concept Videos

The Cochlea01:13

The Cochlea

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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
43.8K

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Updated: May 10, 2025

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

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Intraoperative Assessment of Cochlear Nerve Function During Cochlear Implantation Using the Auditory Nerve Test

Karin Hallin1, Nadine Schart-Morén1

  • 1Department of Surgical Sciences, Otorhinolaryngology and Head and Neck Surgery, Uppsala University, 75185 Uppsala, Sweden.

Audiology Research
|April 25, 2025
PubMed
Summary

The auditory nerve test stimulator (ANTS) effectively assesses cochlear nerve function during surgery. Comparable results between ANTS and cochlear implant (CI) electrical auditory brainstem responses (eABR) were observed, aiding in predicting CI hearing outcomes.

Keywords:
auditory nerve test stimulatorcochlear implantelectrical auditory brainstem responseslong-term deafness

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Auditory nerve (AN) integrity is vital for successful cochlear implant (CI) outcomes.
  • Electrical auditory brainstem responses (eABR) measured via CI can test AN integrity during surgery.
  • The auditory nerve test stimulator (ANTS) offers an alternative method without requiring a CI.

Purpose of the Study:

  • To investigate cases tested with the ANTS at our clinic.
  • To describe hearing results following CI implantation in patients tested with ANTS.
  • To evaluate the efficacy of ANTS in assessing cochlear nerve function.

Main Methods:

  • Preoperative MRI and HRCT to exclude cochlear or retrocochlear pathology.
  • Intraoperative testing using the MED-EL ANTS.
  • Comparison of ANTS-derived eABR with CI-derived eABR in implanted patients.

Main Results:

  • Five patients were tested intraoperatively with ANTS.
  • Three patients (two children, one adult) had no detectable AN.
  • Three patients were implanted with a CI; all achieved hearing, though speech perception varied.

Conclusions:

  • The ANTS is a viable tool for assessing cochlear nerve function during CI surgery.
  • ANTS and CI eABR results showed comparability.
  • Minor latency differences between ANTS and CI stimulation may relate to electrode insertion depth.